"THE COMMERCIAL REVOLUTION OF THE MIDDLE AGES, 950-1350 ~ BY ROBERT S. LOPEZ ~ 1987 ~ CAMBRIDGE UNIVERSITY PRESS, DEDICATED TO TEH YALE DEPT OF HISTORY ~ BOOK WAS ORIGINALLLY PRICED AT $40.00; AND WAS SOLD FOR $20.00 ~ EXTENSIVE DETAILS, HISTORICAL BOOK ~ SOFT COVER ~ 175 PAGES ~ VERY GOOD TO EXCELLENT CONDITION; LIGHTLY USED.